package com.xuecheng.framework.exception;

import com.google.common.collect.ImmutableMap;
import com.xuecheng.framework.model.response.CommonCode;
import com.xuecheng.framework.model.response.ResponseResult;
import com.xuecheng.framework.model.response.ResultCode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;


/**
 * @Author Andrew Yang
 * @ClassName ExceptionCatch
 * @Description 异常捕获类
 * @Package com.xuecheng.framework.exception
 * @create 2020-01-15 00:50
 */
@ControllerAdvice
public class ExceptionCatch {
    private static final Logger LOGGER = LoggerFactory.getLogger(ExceptionCatch.class);
    /**
     * 使用EXCEPTIONS存放异常类型和错误代码的映射，ImmutableMap的特点的一旦创建不可改变，并且线程安全
     */
    private static ImmutableMap<Class<? extends Throwable>, ResultCode> EXCEPTIONS;
    /**
     * 使用builder来构建一个异常类型和错误代码的异常
     */
    protected static ImmutableMap.Builder<Class<? extends Throwable>, ResultCode> builder = ImmutableMap.builder();

    static {
        //在这里加入一些基础的异常类型判断
        builder.put(HttpMessageNotReadableException.class, CommonCode.INVALID_PARAM);
    }

    /**
     * @param e
     * @Method: customException
     * @Author: Andrew Yang
     * @Date: 2020/1/15 0:52
     * @Return com.xuecheng.framework.model.response.ResponseResult
     * @Description: 捕获 CustomException异常
     */
    @ExceptionHandler(CustomException.class)
    @ResponseBody
    public ResponseResult customException(CustomException e) {
        LOGGER.error("catch exception : {}\r\nexception: ", e.getMessage(), e);
        ResultCode resultCode = e.getResultCode();
        return new ResponseResult(resultCode);
    }

    @ExceptionHandler(Exception.class)
    @ResponseBody
    public ResponseResult exception(Exception exception) {
        //记录日志
        LOGGER.error("catch exception:{}", exception.getMessage());
        if (EXCEPTIONS == null) {
            EXCEPTIONS = builder.build();
        }
        final ResultCode resultCode = EXCEPTIONS.get(exception.getClass());
        final ResponseResult responseResult;
        if (resultCode != null) {
            responseResult = new ResponseResult(resultCode);
        } else {
            responseResult = new ResponseResult(CommonCode.SERVER_ERROR);
        }
        return responseResult;
    }
}
